大型民机翼型变弯度气动特性分析与优化设计

为了提高飞机巡航过程中升力系数、马赫数变化后的气动效率,大型民用运输机开始采用机翼变弯度技术。以典型远程宽体客机翼型为例,研究了翼型后缘变弯度对气动性能与压力分布的影响。利用代理模型建立了不同巡航设计工况下,翼型后缘弯度与气动性能的关系。以此为基础,提出了基于代理模型的大型民机翼型变弯度设计优化方法。算例研究表明,在给定巡航升力系数与马赫数下,该方法可以预测出翼型的最佳弯度,从而改善非设计点气动性能。该方法对大型民机机翼变弯度构型设计工作有一定的工程意义。

Aerodynamic analysis and optimization design for variable camber airfoil of civil transport jet

In order to improve the aerodynamic efficiency with the change of lift coefficient and Mach number, the technology of variable camber wing has been applied to civil transport jet. Taking the airfoil of long-range wide body transport jet as a case study, the effects of variable camber on airfoil's aerodynamic performance and pressure distribution are investigated. By applying surrogate model, the relationships between airfoil camber and aerodynamic performance under different design conditions are built. Furthermore, an airfoil variable camber optimization method based on surrogate model is proposed. Testing cases show that the optimization method can predict best camber at given lift coefficient and Mach number, result in aerodynamic performance improvement. The proposed method can be applied to variable wing design in civil transport jet engineering.